diff --git a/lib/private/db/adapter.php b/lib/private/db/adapter.php
index 6742ccdbb453de1ce5b3c3239ef9631b4dc53c78..972008776f6007e642fc95118f20e87208cb18a3 100644
--- a/lib/private/db/adapter.php
+++ b/lib/private/db/adapter.php
@@ -42,7 +42,7 @@ class Adapter {
 	/**
 	 * insert the @input values when they do not exist yet
 	 * @param string $table name
-	 * @param array $input key->value pairs
+	 * @param array $input key->value pair, key has to be sanitized properly
 	 * @return int count of inserted rows
 	 */
 	public function insertIfNotExist($table, $input) {